<template>
<!-- 上传图片组件 -->
  <el-upload
  class="avatar-uploader"
  action="https://jsonplaceholder.typicode.com/posts/"
  :show-file-list="false"
  :on-success="handleAvatarSuccess"
  :before-upload="beforeAvatarUpload">
  <img v-if="imageUrl" :src="imageUrl" class="avatar" />
  <i v-else class="avatar-uploader-icon">
      上传图片
      <em class="el-icon-circle-close"></em>
  </i>
</el-upload>
</template>

<script>
export default {
  props: ['imgIndex'],
  data () {
    return {
      imageUrl: ''
    }
  },
  methods: {
    handleAvatarSuccess (res, file) {
      this.imageUrl = URL.createObjectURL(file.raw)
      this.$emit('uploadImgData', this.imageUrl, this.imgIndex)
    },
    beforeAvatarUpload (file) {
      const isJPG = file.type === 'image/jpeg'
      const isLt2M = file.size / 1024 / 1024 < 2

      if (!isJPG) {
        this.$message.error('上传头像图片只能是 JPG 格式!')
      }
      if (!isLt2M) {
        this.$message.error('上传头像图片大小不能超过 2MB!')
      }
      return isJPG && isLt2M
    }
  }
}
</script>

<style>
.avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
  }
  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }
  .avatar-uploader-icon {
    font-size: 14px;
    color: #8c939d;
    width: 100px;
    height: 60px;
    line-height: 60px;
    text-align: center;
    display: block;
    font-style: normal;
  }
  .avatar-uploader-icon .el-icon-circle-close {
    position: absolute;
    top: -9px;
    right: -9px;
    font-size: 18px;
  }
  .avatar {
    width: 100px;
    height: 60px;
    display: block;
  }
</style>
